Changing engine mounts with engine installed

I've got a floor jack under the oil pan and the front end comes up as I jack. I assume at some point the engine will separate from the mounts? I might try and get a long pry bar in between the mount and crossmember but its awfully tight in there. Perhaps I should try jacking one side at a time to start? I wish I was lifting from the top end as I don't want to wreck the pan.
It will take a bit to get the weight off the suspension.